磨料的再循环通常在喷砂现场进行
A. 正确
B. 错误
After fitting back in place the gear wheels, dont forget () them.
A. to grease
B. greasing
C. oiling
D. lubricating
After ensuring that the () is correct the bearing clearance should be checked.
A. nap
B. gap
C. nip
D. deflectio
半导体色敏传感器可用来直接测量从可见光到红外波段内的单设辐射的波长。
A. 正确
B. 错误